List +Data -base

Generic support for list-like structures in Haskell.
The ListLike module provides a common interface to the various Haskell types that are list-like. Predefined interfaces include standard Haskell lists, Arrays, ByteStrings, and lazy ByteStrings. Custom types can easily be made ListLike instances as well.
ListLike also provides for String-like types, such as String and ByteString, for types that support input and output, and for types that can handle infinite lists.
Version 4.0.2

Common not-so-common functions for lists.
Since Data.List.Extras is prime realestate for extensions to Data.List, if you have something you'd like to contribute feel free to contact the maintainer (I'm friendly). I'm amenable to adopting code if you think your functions aren't enough for a package on their own. Or if you would rather maintain a separate package I can share the Data.List.Extras.Foo namespace.
Version 0.4.1.1

This library provides implementations of finite sets and maps for list keys using tries, both simple and of the Patricia kind. In most (or all? sorry, haven't benchmarked yet) cases, the Patricia tries will have better performance, so use them unless you have reasons not to.
The data types are parametrized over the map type they use internally to store the child nodes: this allows extending them to support different kinds of key types or increasing efficiency. Child maps are required to be instances of the Map class in Data.ListTrie.Base.Map. Some operations additionally require an OrdMap instance.
The Eq, Ord, and Enum modules contain ready structures for key types which are instances of those classes, using lists of pairs, Data.Map, and Data.IntMap respectively.
Version 0.5.1

This small Haskell library provides some type class, types and functions to work with list (and list-like) arrows. List arrows represent computations that may return multiple outputs. Making functions that return lists an instance of both the `Category` and `Arrow` type class allow you to easily compose multiple computations into one with standard building blocks.
Version 0.6.1